Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231..606s&link_type=abstract
Astrophysical Journal, Part 1, vol. 231, July 15, 1979, p. 606-623.
Astronomy and Astrophysics
Astrophysics
23
Abundance, Calcium Isotopes, Cosmic Rays, Galactic Radiation, Spallation, Sulfur Isotopes, Graphs (Charts), Nuclear Reactions, Particle Flux Density, Radiation Detectors, Radiation Distribution, Solar System, Tables (Data)
Scientific paper
A formalism has been developed for deriving cosmic-ray source isotopic abundances from observed local abundances using a purely secondary nuclide as a tracer of spallation production during propagation. Although the formalism is based on the leaky-box model of cosmic-ray propagation, it is shown that source abundances derived by the tracer technique are reasonably independent of detailed propagation models. The tracer formalism also permits a quantitative evaluation of the effects of observational uncertainties on deduced source abundances. It is shown that statistical errors in the observed abundances and uncertainties in the spallation cross sections are at present the dominant sources of uncertainty. The latter error can be reduced with increased detector size or exposure time, while the former can be minimized by measurements of the relative production cross sections. As a specific example, the tracer technique is applied to the isotopes of sulfur and calcium, and the level of uncertainties which must be achieved to distinguish evolutionary differences between solar-system material and cosmic ray-source material are established.
Stone Edward C.
Wiedenbeck Mark E.
No associations
LandOfFree
A secondary tracer approach to the derivation of galactic cosmic-ray source isotopic abundances does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A secondary tracer approach to the derivation of galactic cosmic-ray source isotopic abundances, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A secondary tracer approach to the derivation of galactic cosmic-ray source isotopic abundances will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1556025